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tekilochka [14]

3 years ago

5

Cut out a piece of cardboard in the shape of a letter C and locate the center of mass. is it within the frame of the letter? Can

it be balanced at the center of mass? Yes or no. Explain.

1 answer:

Mice21 [21]3 years ago

3 0

Answer:

No

Explanation:

Because the mass of the object on the sides are not filled in a way to be able to find the center of the mass.

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A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.09 kg sample of carbon from the wood ha

fgiga [73]

Answer:

t = 17199 years

Explanation:

given,

mass of sample = 1.09 Kg

Activity of living material = 15 decays / min /g

Activity of living material = 15 x 1000 decays /min /kg

Activity of living material per 1.09 kg A = 1.09 x 15 x 1000 decays / min

Activity of after time t is A ' = 2020

half life = 57300 years

desegregation constant

λ = 0.693 / 5700

$A'= A e^{-\lambda\ t}$

$A'= 1.09 \times 15 \times 1000 e^{-\lambda\ t}$

$2020= 1.09 \times 15 \times 1000 e^{-\dfrac{0.693}{5700}\times t}$

$0.124=e^{-\dfrac{0.693}{5700}\times t}$

taking ln both side

$\dfrac{0.693}{5700}\times t = 2.09$

t = 17199 years

5 0

3 years ago

Which type of light-matter interaction causes glare?

AleksandrR [38]

Answer:

I think the reflection of light off of a shiny surface is the answer... Hope this helps

Explanation:

3 0

3 years ago

an athlete running 2.6m/ increases his velocity to 3.7m/s in 2.7s. what is the acceleration of the runner

iVinArrow [24]

Acceleration= velocity/time

1.1/2.7=0.41

The acceleration is .41 m/s^2

4 0

3 years ago

A cheetah ran 300 feet in 2.92 seconds. What was the cheetah’s average speed in miles per hour?

olganol [36]

We will first convert feet to miles:
1 foot = 0.00018939 miles
300 foot = 0.056817 miles
Than seconds to hours:
2.92 seconds = 0.04867 minutes = 0.0008111 hours
Average speed :
v = d / t
v = 0.056817 miles / 0.008111 h
v = 70.05 miles per hour

6 0

3 years ago

Materials will have different energies associated with the electrons inside them. This is related to how strongly bound they are

andrey2020 [161]

Answer:

E = 401.3 eV

Explanation:

As we know that the thinnest gap in the direction of metal is given as

$t = 3.09 nm$

so here we can say that lowest energy of photon will not able to break this electron from above thickness

so we will have

$E = \frac{hc}{\lambda}$

here we have

$hc = 1240 nm-eV}$

also we have

$\lambda = 3.09 nm$

so we will have

$E = \frac{1240}{3.09} eV$

$E = 401.3 eV$

7 0

4 years ago